Chemistry of inorganic compounds – Oxygen or compound thereof – Peroxide
Reexamination Certificate
2006-05-23
2006-05-23
Langel, Wayne A. (Department: 1754)
Chemistry of inorganic compounds
Oxygen or compound thereof
Peroxide
Reexamination Certificate
active
07048905
ABSTRACT:
Process for the production of concentrated aqueous solutions of hydrogen peroxide, comprising the following steps: (a) feeding to a reactor containing a catalyst based on palladium and platinum, heterogeneous and maintained in dispersion in a liquid reaction medium: (i) a liquid stream consisting of an alcohol or a mixture of C1–C3 alcohols or a mixture of said alcohols with water containing at least 50% by weight of alcohol, also containing an acid promoter and a halogenated promoter, the alcohol and optionally all or part of the water contained in the stream being recycled from the subsequent phase d); (ii) a gaseous stream containing hydrogen, oxygen and an inert gas, characterized in that the concentration of the hydrogen is less than 4.5% by volume and the concentration of the oxygen is less than 21% by volume, the complement to 100 being an inert gas; (b) removing from the reactor: (iii) a liquid stream consisting of stream (i) and also containing the hydrogen peroxide and water produced by the reaction, characterized in that the concentration of hydrogen peroxide ranges from 2% to 10% by weight; and (iv) a gaseous stream essentially consisting of non-reacted hydrogen and oxygen and the inert gas, (c) optionally adding to (iii) water in such a quantity so that its content is at least equal to that of the final aqueous solution of hydrogen peroxide; (d) sending the stream deriving from (c) to a system consisting of one or more evaporators or distillation columns from which the following are removed: (v) one or more streams containing all the alcohol and possibly water, which are recycled to (a); (vi) a concentrated aqueous solution of H2O2 at a concentration ranging from 15 to 60% by weight; (vii) optionally a stream containing the water fed in excess in (c).
REFERENCES:
patent: 4335092 (1982-06-01), Dalton, Jr. et al.
patent: 4564514 (1986-01-01), Drauz et al.
patent: 5194242 (1993-03-01), Paoli
patent: 5641467 (1997-06-01), Huckins
patent: 5670028 (1997-09-01), Inaba et al.
patent: 6375920 (2002-04-01), Fischer et al.
patent: 6649140 (2003-11-01), Paparatto et al.
patent: 6780288 (2004-08-01), Bloomfield et al.
patent: 0 787 681 (1997-08-01), None
patent: 0 978 316 (2000-02-01), None
Andrigo Pietro
De Alberti Giordano
Paparatto Giuseppe
Rivetti Franco
Romano Ugo
ENI S.p.A.
Langel Wayne A.
Polimeri Europa S.p.A.
LandOfFree
Process for the production of hydrogen peroxide does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of hydrogen peroxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of hydrogen peroxide will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3536212